Nut and bolt cap



Aug. 2s, 1945.-

A. H. BOELTER NUT AND BOLT AP Filed Dec. 2, 1943 v lnvntor 74? THU@ H5051. TE@

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B] Il i.' WWM@ Patented Aug. 28, 1945 UNITED STATES ATENT OFFICE 1 Claim.

v This invention relates to new and useful improvements in safety devices and more particu.v

larly to means for preventing injury, especially around bowling alleys and elsewhere due to the presence of protruding nuts and bolt ends.

The principal object of the present invention is to provide a cap which can be readily disposed over exposed bolt ends and nuts so as to preclude the possibility of personal injury.

Othergobjects and advantages of the invention will become apparent to the reader of the following description.

In the drawing:

Figure 1 represents a fragmentary side elevational view showing a hook bolt supporting a bowling alley cushion with the exposed end and nut thereof covered by the present invention.

Figure 2 is a section taken substantially on the line 2-2 of Figure 1.

Figure 3 is a top plan view of thecap.

Referring to th`e drawing wherein like numerals designate like parts, it can be seen that for the purpose of illustration, numeral 5 denotes a bar such as is used around bowling alleys for supporting a cushion 6. usually provided with eyes 1 which engage over the hook ends 8 of hook bolts 9. These bolts 9 usually extend upwardly through the bar 5 and are equipped with nuts I0. Frequently these nuts and the upwardly protruding upper ends of the bolts 9 cause injury to pin boys and others who may chance to strike against the same.

Numeral Il generally refers to the present invention and this is a convex-shaped cap member l2 of wood or any other inexpensive material These cushions are fiat side and denoted by numeral I3,

formed with a recess 'extending inwardly from its This recess is sufficiently large to accommodate the usual washer and nut of the bolt 9 and also that portion of the bolt which may projectupwardly from the nut. f

The cap l2 has several openings Hl through which securing elements l5 may be driven to secure the cap firmly to the bar 5. These securing elements l5 are, of course, countersunk in the cap I2.

While the foregoing specication sets forth the invention in specific terms it is to be understood that numerous changes in the shape, size and invention, what is `,ameter of the flat b'ase being at least four times the altitude of the dome thereby affording a relatively gentle slope to the curved surface and a steppedaXial socket of a diameter not greatly exceeding the width of the surrounding surface extending inwardly thereof from said face and adapted to fit around said nut and washer to enclose the same, said body being provided with edge apertures adapted for the insertion of fastening screws therethrough.

ARTHUR H. BOELTER. 

